/* ==========================================================================
   Apoorv Vyas — personal site
   Palette continues the blue/amber of the previous site, deepened.
   Type: Archivo (display) + Source Serif 4 (body) + IBM Plex Mono (data).
   ========================================================================== */

:root {
  --paper:        #FBFBFA;
  --surface:      #FFFFFF;
  --surface-2:    #F4F5F7;
  --ink:          #14171C;
  --ink-2:        #3B414D;
  --muted:        #667085;
  --line:         #E4E5E9;
  --line-strong:  #C9CCD4;
  --wave:         #B6BBC6;
  --name-weight:  600;
  /* Inlined rather than url(images/wave.svg): Chrome gives file://
     resources opaque origins, and a blocked mask renders as nothing.
     One shape for every skin — they differ by colour and tempo only. */
  --wave-svg:       url("data:image/svg+xml,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22240%22%20height%3D%2224%22%20viewBox%3D%220%200%20240%2024%22%3E%3Cpath%20d%3D%22M2%205.8h2v12.4h-2zM8%202.9h2v18.2h-2zM14%201.1h2v21.8h-2zM20%201.7h2v20.6h-2zM26%204.3h2v15.4h-2zM32%201.9h2v20.2h-2zM38%201.5h2v21h-2zM44%203.4h2v17.2h-2zM50%206.1h2v11.8h-2zM56%205.6h2v12.8h-2zM62%206.4h2v11.2h-2zM68%207.7h2v8.6h-2zM74%208.7h2v6.6h-2zM80%208.9h2v6.2h-2zM86%209h2v6h-2zM92%208.7h2v6.6h-2zM98%208.4h2v7.2h-2zM104%207.2h2v9.6h-2zM110%205.7h2v12.6h-2zM116%205h2v14h-2zM122%205.8h2v12.4h-2zM128%202.9h2v18.2h-2zM134%201.1h2v21.8h-2zM140%201.7h2v20.6h-2zM146%204.3h2v15.4h-2zM152%201.9h2v20.2h-2zM158%201.5h2v21h-2zM164%203.4h2v17.2h-2zM170%206.1h2v11.8h-2zM176%205.6h2v12.8h-2zM182%206.4h2v11.2h-2zM188%207.7h2v8.6h-2zM194%208.7h2v6.6h-2zM200%208.9h2v6.2h-2zM206%209h2v6h-2zM212%208.7h2v6.6h-2zM218%208.4h2v7.2h-2zM224%207.2h2v9.6h-2zM230%205.7h2v12.6h-2zM236%205h2v14h-2z%22%2F%3E%3C%2Fsvg%3E");
  --accent:       #2C3BD1;
  --accent-soft:  #EDEFFD;
  --signal:       #9A5B06;

  --font-display: "Archivo", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body:    "Source Serif 4", Georgia, "Times New Roman", serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --max: 880px;
  --gutter: 24px;
  --radius: 10px;

  color-scheme: light;
}

html[data-theme="dark"] {
  --paper:        #0D1016;
  --surface:      #12161D;
  --surface-2:    #171C25;
  --ink:          #E9EBF0;
  --ink-2:        #C3C8D3;
  --muted:        #8B93A3;
  --line:         #232833;
  --line-strong:  #39414F;
  --wave:         #454E60;
  --name-weight:  500;
  --accent:       #8C97FF;
  --accent-soft:  #1A2033;
  --signal:       #E9A13F;

  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    --paper:        #0D1016;
    --surface:      #12161D;
    --surface-2:    #171C25;
    --ink:          #E9EBF0;
    --ink-2:        #C3C8D3;
    --muted:        #8B93A3;
    --line:         #232833;
    --line-strong:  #39414F;
    --wave:         #454E60;
    --name-weight:  500;
    --accent:       #8C97FF;
    --accent-soft:  #1A2033;
    --signal:       #E9A13F;

    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

img, video { max-width: 100%; display: block; }

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 10px 16px;
  z-index: 50;
  border-radius: 0 0 8px 0;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}
.skip:focus { left: 0; }

/* ---------------------------------------------------------------- nav ---- */

.nav {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav-inner {
  display: flex;
  align-items: center;
  gap: 20px;
  height: 52px;
}

.nav-name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: -0.01em;
  color: var(--ink);
  margin-right: auto;
  white-space: nowrap;
}
.nav-name:hover { text-decoration: none; color: var(--accent); }

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
}

.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.nav-links a:hover { color: var(--ink); text-decoration: none; }

.theme-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  width: 30px;
  height: 30px;
  border-radius: 8px;
  cursor: pointer;
  display: grid;
  place-items: center;
  flex: none;
  transition: color .15s ease, border-color .15s ease;
}
.theme-btn:hover { color: var(--ink); border-color: var(--line-strong); }
.theme-btn svg { width: 15px; height: 15px; }
.theme-btn .icon-dark { display: none; }
html[data-theme="dark"] .theme-btn .icon-dark { display: block; }
html[data-theme="dark"] .theme-btn .icon-light { display: none; }
@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .theme-btn .icon-dark { display: block; }
  html:not([data-theme="light"]) .theme-btn .icon-light { display: none; }
}

@media (max-width: 640px) {
  .nav-links .nav-opt { display: none; }
  .nav-links { gap: 14px; }
}

/* Below ~430px the name, five links and the toggle no longer fit on one line,
   and the links do not wrap — so the navbar would run off the screen. Drop the
   longest label; Research and CV are the two worth keeping. */
@media (max-width: 560px) {
  .nav-links .nav-opt-sm { display: none; }
}

/* --------------------------------------------------------------- hero ---- */

.hero { padding-top: 60px; }

/* Identity block: portrait beside name, role and links.
   The bio runs full width beneath, where a longer measure reads better. */
.hero-top {
  display: grid;
  grid-template-columns: 180px 1fr;
  gap: 40px;
  align-items: center;
}

.hero-id { min-width: 0; }

.hero-bio { margin-top: 30px; }

.hero-name {
  font-family: var(--font-display);
  font-weight: var(--name-weight);
  font-size: clamp(2.4rem, 6.5vw, 3.5rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  margin: 0 0 13px;
  color: var(--ink);
}


/* Archivo is a variable face and light-on-dark blooms, so the dark theme steps
   the name down a notch. Carried on a token rather than a selector: as a rule
   it scored (0,2,1) and silently outranked every skin's own .hero-name, which
   dragged Silkscreen from bold to regular between light and dark. */

.hero-role {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 17px;
  line-height: 1.7;
}
.hero-role a { color: var(--ink-2); border-bottom: 1px solid var(--line-strong); }
.hero-role a:hover { color: var(--accent); border-color: var(--accent); text-decoration: none; }

.lede {
  font-size: 1.14rem;
  line-height: 1.55;
  color: var(--ink);
  margin: 0 0 14px;
}

.hero-bio p { margin: 0 0 14px; color: var(--ink-2); }

.hero-top > picture { display: block; }

.portrait {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: var(--surface-2);
}

/* --------------------------------------------------------------- links --- */

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.links a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 7px 13px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  color: var(--ink-2);
  transition: border-color .15s ease, color .15s ease, background .15s ease;
}
.links a:hover {
  color: var(--accent);
  border-color: var(--accent);
  background: var(--accent-soft);
  text-decoration: none;
}

.cv-stamp {
  margin: 11px 0 0;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.05em;
  color: var(--muted);
}
/* An element holding only a comment still counts as :empty, so an unstamped
   build simply hides the line rather than leaving a gap. */
.cv-stamp:empty { display: none; }

/* ------------------------------------------------- signature wave rule --- */

.wave-rule {
  height: 24px;
  margin: 52px 0 0;
  background-color: var(--wave, var(--line-strong));
  opacity: 1;
  -webkit-mask-image: var(--wave-svg);
  mask-image: var(--wave-svg);
  -webkit-mask-repeat: repeat-x;
  mask-repeat: repeat-x;
  -webkit-mask-size: 240px 24px;
  mask-size: 240px 24px;
  -webkit-mask-position: center;
  mask-position: center;
}

@keyframes wave-flow {
  from { -webkit-mask-position: 0 center;     mask-position: 0 center; }
  to   { -webkit-mask-position: 240px center; mask-position: 240px center; }
}

/* ------------------------------------------------------------ sections --- */

.wave-rule--end { margin-top: 44px; opacity: 0.7; }

.section {
  padding-top: 46px;
  scroll-margin-top: 66px;   /* clears the sticky nav on anchor jumps */
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
  margin-bottom: 22px;
}

.section-head h2 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0;
}

.section-note {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--muted);
  margin-left: auto;
}
.section-note a { color: var(--muted); text-decoration: underline; text-underline-offset: 3px; }
.section-note a:hover { color: var(--accent); }

/* -------------------------------------------------------- research grid -- */

.focus {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: 14px;
}

.focus-card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 16px 18px 18px;
}

.focus-card h3 {
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0 0 6px;
  color: var(--ink);
}

.focus-card p {
  margin: 0;
  font-size: 0.925rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------------------------------------------------------------- news --- */

.news { margin: 0; }

.news-item {
  display: grid;
  grid-template-columns: 104px 1fr;
  gap: 18px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line);
}
.news-item:last-child { border-bottom: 0; }

.news-date {
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  padding-top: 4px;
}

.news-item p { margin: 0; font-size: 0.97rem; color: var(--ink-2); }

/* -------------------------------------------------------- publications -- */

.pubs { display: grid; gap: 30px; }

.pub {
  display: grid;
  grid-template-columns: 236px 1fr;
  gap: 26px;
  align-items: start;
}

.pub-media {
  position: relative;
  display: block;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--surface-2);
}

/* ---- media affordances ---- */

.pub-media[data-playable]::after,
.pub-media.is-zoom::after {
  content: "▶";
  position: absolute;
  left: 8px;
  bottom: 7px;
  font-size: 0.58rem;
  line-height: 1;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(0, 0, 0, 0.5);
  border-radius: 5px;
  padding: 4px 7px;
  pointer-events: none;
  transition: opacity .18s ease;
}
.pub-media.is-zoom::after { content: "⤢"; }
.pub-media[data-playable].is-playing::after { opacity: 0; }
.pub-media.is-zoom:hover::after { background: var(--accent); }
.pub-media.is-zoom:hover { text-decoration: none; }

.sound-btn {
  position: absolute;
  right: 7px;
  bottom: 7px;
  width: 27px;
  height: 27px;
  padding: 0;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  cursor: pointer;
  opacity: 0;
  transition: opacity .18s ease, background .18s ease;
}
.sound-btn svg { width: 14px; height: 14px; }
.sound-btn .i-on { display: none; }

.pub-media:hover .sound-btn,
.pub-media:focus-within .sound-btn,
.pub-media.has-sound .sound-btn { opacity: 1; }

.sound-btn:hover { background: var(--accent); }

.pub-media.has-sound .sound-btn { background: var(--accent); }
.pub-media.has-sound .sound-btn .i-on { display: block; }
.pub-media.has-sound .sound-btn .i-off { display: none; }

/* No hover on touch, so keep the control permanently visible there. */
@media (hover: none) {
  .sound-btn { opacity: 1; }
}

/* contain, not cover: the older entries are paper figures with wide or tall
   aspect ratios, and cropping them loses the point of the figure. The generated
   16:9 posters fill the box exactly either way. */
.pub-media img,
.pub-media video {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: var(--surface-2);
}

.pub-title {
  font-family: var(--font-display);
  font-size: 1.03rem;
  font-weight: 600;
  letter-spacing: -0.012em;
  line-height: 1.35;
  margin: 0 0 6px;
  color: var(--ink);
}
.pub-title a { color: inherit; }
.pub-title a:hover { color: var(--accent); text-decoration: none; }

.pub-authors {
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0 0 9px;
}
.pub-authors .me { color: var(--ink); font-weight: 600; }

.pub-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 9px;
}

.chip {
  font-family: var(--font-mono);
  font-size: 0.665rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}

.chip-venue {
  background: var(--accent-soft);
  color: var(--accent);
}

.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-family: var(--font-mono);
  font-size: 0.735rem;
  letter-spacing: 0.03em;
}
.pub-links a { color: var(--accent); }
.pub-links a::before { content: "↗ "; opacity: 0.5; }

.pub-blurb {
  margin: 9px 0 0;
  font-size: 0.925rem;
  line-height: 1.55;
  color: var(--muted);
}

/* ------------------------------------------------------- earlier work --- */

.earlier {
  margin-top: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.earlier > summary {
  cursor: pointer;
  list-style: none;
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  align-items: center;
  gap: 10px;
}
.earlier > summary::-webkit-details-marker { display: none; }
.earlier > summary::before {
  content: "+";
  font-size: 0.95rem;
  line-height: 1;
  color: var(--accent);
}
.earlier[open] > summary::before { content: "–"; }
.earlier > summary:hover { color: var(--accent); }

.earlier-body {
  padding: 4px 18px 20px;
  display: grid;
  gap: 20px;
}

.pub-sm {
  display: grid;
  grid-template-columns: 132px 1fr;
  gap: 18px;
  align-items: start;
}

.pub-sm .pub-media { border-radius: 8px; }
.pub-sm .pub-title { font-size: 0.94rem; }
.pub-sm .pub-authors { font-size: 0.83rem; margin-bottom: 7px; }

/* ---------------------------------------------------------- experience -- */

.roles { display: grid; gap: 4px; }

.role {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px 20px;
  padding: 15px 0;
  border-bottom: 1px solid var(--line);
}
.role:last-child { border-bottom: 0; }

.role-org {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--ink);
}

.role-when {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  white-space: nowrap;
  padding-top: 4px;
}

.role-titles {
  grid-column: 1 / -1;
  font-family: var(--font-mono);
  font-size: 0.735rem;
  color: var(--muted);
  margin: 2px 0 0;
  line-height: 1.7;
}

.role-body {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.role-body li {
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink-2);
  padding-left: 16px;
  position: relative;
}
.role-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--line-strong);
}
.role-body strong { color: var(--ink); font-weight: 600; }

/* ---------------------------------------------- education + service ----- */

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 14px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 18px;
}

.panel h3 {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 12px;
}

.panel p { margin: 0 0 10px; font-size: 0.94rem; line-height: 1.5; color: var(--ink-2); }
.panel p:last-child { margin-bottom: 0; }
.panel strong { color: var(--ink); font-weight: 600; }
.panel .sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  color: var(--muted);
  margin-top: 1px;
}

/* -------------------------------------------------------------- footer -- */

.footer {
  margin-top: 18px;
  padding: 18px 0 56px;
  border-top: 0;
  font-family: var(--font-mono);
  font-size: 0.71rem;
  letter-spacing: 0.04em;
  color: var(--muted);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  justify-content: space-between;
}

/* ------------------------------------------------------------ responsive */

@media (max-width: 760px) {
  body { font-size: 16px; }

  .hero { padding-top: 38px; }
  .hero-top {
    grid-template-columns: 1fr;
    gap: 18px;
    align-items: start;
  }
  .hero-bio { margin-top: 22px; }
  .portrait { width: 116px; height: 116px; }

  .pub { grid-template-columns: 1fr; gap: 14px; }
  .pub-media { max-width: 340px; }

  .pub-sm { grid-template-columns: 104px 1fr; gap: 14px; }

  .news-item { grid-template-columns: 1fr; gap: 3px; }
  .news-date { padding-top: 0; }

  .role { grid-template-columns: 1fr; }
  .role-when { padding-top: 0; }

  .wave-rule { margin-top: 40px; }
  .wave-rule--end { margin-top: 34px; }
  .section { padding-top: 38px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* --------------------------------------------------------------- print -- */

@media print {
  .nav, .wave-rule, .theme-btn, .links { display: none; }
  body { font-size: 11pt; background: #fff; color: #000; }
  .pub { grid-template-columns: 1fr; page-break-inside: avoid; }
  .pub-media { display: none; }
  .earlier[open] > summary { display: none; }
  a { color: #000; }
  .section { padding-top: 18pt; }
}